// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/filters/memory_data_source.h"

#include <algorithm>

#include "base/logging.h"

namespace media {

MemoryDataSource::MemoryDataSource(const uint8_t* data, size_t size)
    : data_(data)
    , size_(size)
{
}

MemoryDataSource::~MemoryDataSource() { }

void MemoryDataSource::Read(int64_t position,
    int size,
    uint8_t* data,
    const DataSource::ReadCB& read_cb)
{
    DCHECK(!read_cb.is_null());

    if (is_stopped_ || size < 0 || position < 0 || static_cast<size_t>(position) > size_) {
        read_cb.Run(kReadError);
        return;
    }

    // Cap size within bounds.
    size_t clamped_size = std::min(static_cast<size_t>(size),
        size_ - static_cast<size_t>(position));

    if (clamped_size > 0) {
        DCHECK(data);
        memcpy(data, data_ + position, clamped_size);
    }

    read_cb.Run(clamped_size);
}

void MemoryDataSource::Stop()
{
    is_stopped_ = true;
}

void MemoryDataSource::Abort() { }

bool MemoryDataSource::GetSize(int64_t* size_out)
{
    *size_out = size_;
    return true;
}

bool MemoryDataSource::IsStreaming()
{
    return false;
}

void MemoryDataSource::SetBitrate(int bitrate) { }

} // namespace media
